Abstract
In this paper, Y1 − x La x PO4:Eu3+ (x = 0.5, 0.7, and 0.3) nanophosphors were synthesized by a rather simple method. The products present different morphologies. For Y1 − x La x PO4:Eu3+, they have similar phase composition of a mixture of monoclinic LaPO4 and tetragonal YPO4. Furthermore, the luminescence behavior of Eu3+ has been investigated in this type of matrices. In Y1 − x La x PO4:Eu3+, the 5D0-7F1 magnetic dipole transition is dominant, indicating that the Eu3+ site is inversion symmetry. The difference in the Eu-O charge transfer (CT) band with La3+ ion concentration suggests the difference in the ionicity of the Eu-O bond. Among those products, the red to orange intensity ratio (R/O) of 5D0-7F2 to 5D0-7F1 value of Eu3+ is different, furthermore, for La3+ x = 0.3, the R/O value of Eu3+ is the biggest on the contrary, indicating that the inversion symmetry Eu3+ is lowest.
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